January Jones and son Xander stepped out in Pasadena on Monday afternoon, and we can't believe how big the Mad Men star's little boy is getting!

And it doesn't seem to matter how much time has gone by since she gave birth in 2011, but she seems intent on staying mum about who Xander's father is. "It's just not something the public needs to know. I don't divulge my sexual preferences," January sniped to Net-a-Porter's The Edit last spring. "There are parts of your life -- no matter what your job -- that should remain private."

We see January's point, but as Xander gets older and starts to look more and more like a certain actor who starred in Horrible Bosses his dad (whoever it may be), isn't it going to become more and more obvious? And will he have a relationship with his other parent?